Valve control



H. L. LUTHER VALVE CONTROL April 10, 1956 4 Sheets-Sheet 1 Filed 001;.8, 1951 FIG.

INVENTOR HERBERT L LUTHER 444 ATTORNEY H. L. LUTHER VALVE CONTROL April10, 1956 4 Sheets-Sheet 2 Filed Oct. 8 1951 FIG. 2.

FIG. 3'.

INVENTOR HERBERT L. LUTHER BY I h;- ATTORNEY April 10, 1956 H. L. LUTHER2,741,251

VALVE CONTROL Filed Oct. 8, 1951 4 Sheets-Sheet. 3

F G INVENTOR HERBERT L. LUTHER BY 4 4z 5.

ATTORNEY April 10, 1956 Filed Oct. 8, 1951 H. LUTHER 2,741,251

VALVE CONTROL 4 Sheets-Sheet 4 F I G 9 J83 a 9? "null!!! 92 93 9| 88 45b V INVENTOR 90- HERBERT L. LUTHER 0 WA? 8 9 f i BY fmwzw L; .'J J2ATTORNEY United States atent VALVE CQNTROL Herbert L. Luther,Elizabethton, Team, assignor to North American Rayon Corporation, NewYork, N. Y., a corporation of Delaware Application October 3, 1251,Serial No. 250,287 8 Claims. (Cl. 13449) This invention relates toapparatus for controlling liquid sprayers of the type adapted to beactuated by a mobile body carrying the material to be sprayed.

An object of this invention is to provide an improved liquid sprayercontrol.

Another object of this invention is to provide a controller for liquidvalves adapted to be used for liquid sprayers or washers in which anunlimited time range operating cycle may be provided.

Still another object of this invention is to provide a remote controlfor operating liquid valves without the use of electrical or compressedair devices.

Still another object of this invention is to provide a controller forthe liquid valve of a sprayer in which another operating cycle may beinitiated even if the previous operating cycle was not completed.

Still another object of this invention is to provide an improved liquidvalve controller adapted to be tripped by the vehicle carrying thematerial to be washed or sprayed.

Other and further objects of this invention will be apparent to thoseskilled in the art to which it relates from the following specification,claims and drawing.

In accordance with this invention there is provided an improvedcontroller for liquid valves adapted to be used with sprayers or washersfor spraying or washing the acid and salt olf of cars and spool holdersattached thereto which are used in the manufacture of rayon and thelike; The cars may be of the type employed in a monorail transportationsystem which is provided with suitable washing stations. When the valvecontroller employed in accordance with this invention is tripped by thecar the operating cycle of the controller is initiated. Thereafter thevalve in the water supply line is permitted to be opened by the waterpressure of the supply so that water is fed to the Sprayers for sprayingthe car and material and fixtures brought to the washing station by thecar. After a predetermined time the liquid valve controller causes thevalve to close and interrupt the water supply.

Further details of this invention will be set forth in the followingspecification and drawing in which briefly:

Fig. 1 is a side view of an embodiment of this apparatus;

Fig. 2 is a top view of an embodiment of this appa ratus;

Fig. 3 is a detail view taken along the line 3-3 of Fig. 1;

Fig. 4 is a detail view of the valve controller tripping mechanism;

Fig. 5 is a front view of the mechanism shown in Fig.4;

Fig. 6 is a sectional view taken along the line 6-6 of- Fig. 4;

Fig. 7 is a sectional view taken along the line 7-7 of Fig. 4;

Fig. 8 is a detail sectional view of the valve and valve controller and'ice Fig. 9 is a detail sectional view of the small relief valveemployed in the controller shown in Fig. 8.

Referring to the drawing in detail there is shown in Fig. 1 atransportation car 10 employed for transporting spools or other fixturesor similar material 11 to be washed or sprayed. This car 10 is supportedby wheels 12 which ride upon the monorail 13 and is illustrated in Fig.1 between the spray nozzles or outlets 14 located in the spray booth orwashing station 15 that is illustrated in fragmentary section. The car10 and spool holders carried by it are in correct position to be sprayedjust after the wheels 12 have passed under the shoes 50 as will bedescribed hereinafter. The spray nozzles are preferably arranged with aplurality thereof on each side of the car 10 and these are connected tosuitable headers 16, one of which is positioned on each of the lateralsides of the spray booth 15 as shown in Fig. 2. The headers 16 areconnected to pipes 17 which in turn are connected to the supply pipe 18and to the outlet of the valve 19.

The valve 19 is connected to the valve controller 20 by the tube 21. Thebottom of the controller casing is which is bolted to the top of theupright member 25.

The bottom of the upright member 25 is welded to the center of themonorail 13 so as not to interfere with the passage of the wheels 12 ofthe car 10. A suitable bracket 23 extends to the side of the right anglebracket 22 and is attached thereto by welding. The bracket 23 isattached by means of the U-shaped member 26 to the supply pipe 18entering the outlet port of the valve 19 as shown in Figs. 1 and 4. Ofcourse in cases where the valve controller 26 is located at a pointremote from the valve 19 the bracket 23 would be supportedindependently.

The upright member 25 is provided with a vertically extending slot 27for receiving the bolt 28. This bolt 28 is provided with a bearingsleeve 29 which movably fits into the slot 27 as shown in the detailsectional view Fig. 7.

The bolt 28 passes through the bars 30, through the slots 31 formed inthe clevis 32 and through the slot 27 of the upright member 25. Thisbolt 28 functions to hold the clevis 32 and the bars 30 in assembledrelation. When the bars 39 are in their lower position the bolt 28 restsin the bottom of the slot 27 and also in the bottoms of the slots 31.The slots 31 are shorter than the slot 27 so that as the bars 36 aremoved upward by the car wheels 12 the clevis 32 is lifted from itssupport at the top of the member 25 when the bolt 28 reaches the top ofthe slots 31 as will be described hereinafter in the operation of thisdevice.

The rod 33 is provided with a head 34 held in the socket 35 that isattached to the top of the clevis 32 by the bolts 36. The top portion ofthis rod 33 is slidable in the sleeve 37 that is attached by welding orin any other suitable manner to the bottom of the bracket 22. The top ofthe rod 33 is pivotally attached to the lower end of the rod 38 by thepin 39. The rod 38 is provided with a counterweight 40 which extendsthrough a slot formed in the bracket 22, as shown in Fig. 6, and

is arranged to maintain the head 41, provided at the upper end of thisrod, in slidable contact with the bracket of the controller 20 for thecavity 74 of the valve controller 7 20 is also provided the purpose ofspring biasing the rod 45 for normally maintaining this rod projecting agiven length from the controller bottom. 7

The bars 39 have the ends Lhereof provided with downwardly extendingmembers '49 and each of thesemembers is provided with .a shoe 59attached thereto by suitable bolts. Suitable flat upright members 49aextending -up ward through slots formed in the shoes 50, are welded tothe top of the rail 13 to function as guides for these shoes and keepthem aligned with the rail 13 as shown in Fig. 2. The shoes are engagedby the wheels 12 of the car when the car is moved into the spray booth15 so that the bars are lifted a predetermined distance when both of theshoes are directly over the corresponding wheels 12. At this positionthe bars 30 function to move the clevis 32 and the rods 33, 38 and 44upward sufliciently to trip the valve controller 20 as will be describedin detail hereinafter. I

The valve 19 and valve controller 20 are shown in detail in Figs. :8 and'9. In general the valve 19 is constructed as shown in U. S. Patent 'No.1,714,573 issued to W. E. Sloan. However, the control of the valve 19 isentirely different from the manual control shown in this patent, Theinlet port 51 of the valve 19 is connected to the water supply pipe 52and water is passed through the valve 1-9 and through the outlet port 53thereof to the pipe 18 when the diaphragm 54, which is clamped betweenthe shoulder-55 and the periphery of the cap 56, is in its openposition. When this diaphragm 54 is in its closed position, that is,when his pressed against the upper, edge 57 of 'the circular wall member58, water is prevented from flowing through the valve.

The diaphragm 54 is provided with a small port 59 which connects theinlet channel 60 with the cavity61 in back of the diaphragm 54-. Thisport 59 permits Water to flow from the inlet channel 69 into the cavity61 to fill up this cavity and to equalize the pressure in the cavity 61,tube "21 and in thehousing of the controller 20 with that in the channel58. Water also flows from the cavity 61'through the tube 62 which isthreaded into the top of the cap 56, and through the tube 21 connectedto the top of the tube 62 into the casing of the valve controller 20.The bottom of the tube 62 is provided with a slot 62a to prevent the endof this tube from being closed when the valve cap 66 is in its uppermostposition.

The central partjof the diaphragm 54 is clamped be.-

tween the parts 63 and 64 by means of the threaded member 65, cap 66,bolt 67 and washer 68. The body portion of the member 64 projects downinto the tubular member 58 and is provided with guiding'wings 69-locatedat intervals around the circumference'thereof.

The valve controller 29 is connected to the valve by the tube 21 whichis coupled to the upper cap 70 of the.

valve controller by means of the fitting 7.1 thatis threaded into thetop of the cap 76 and into the coupling 7 2 of 4 diameter of the tubularmember 79 so as to provide'an air passage therebetween for venting ofthe device and a pair of holes 79a are also provided to the tubularmember 79. These holes are positioned so as to clear the bottom surfaceof the cap 79 in order to properly vent the inside of the controllerchamber.

The body portion of the valve controller 20 consists of a pipe threadedat the top to receive thethreaded cap 70 and also threaded at the bottomto receive the threaded bottom 83. The bottom 83 is provided with asleeve 84 which functions as a bearing for the rod 45. This rod is madewith a shoulder 85 for engaging the top .of the sleeve 84 to prevent therod from being pushed all the way out of the valve controller 20 by thespring 48. The top portion of the rod 45 is of substantially reducedcross section to engage the pin 86 of the small relief valve 87 that ispositioned on the top of the float valve'88.

The relief valve 87 is shown in substantially enlarged cross section inFig. 9 and consists of a bottom spider member 89, a spring 90, bushing99a with radially disposed Wings 90b and a top cap member 91 all ofwhich are held together by the centrally disposed rivet 92 which extendsfrom the cap 91 through the member 89. The cap 91 includes aninnerrmember' 93 attached thereto for holding a resilient sealing member94 therein. The seal retaining member 93 is also held assembled with theother 7 parts of the valve by the rivet 92.

The relief valve 87 is positioned in a small opening at the top of thefloat valve 88 and when this relief valve 87 is opened by the rod 45 toopen the passage between the sealing ring 94 and the top surface of thefloat valve 88, the bottom edge of the float valve 88 is in contact vwiththe top surface of the ring 95 that isheld in a cavity the tube 21.An orifice plug 73 is positioned inside of the ,fitting 71 to controlthe rate at which water flows'into The top '70 or" the valve controllerwith a vent and vacuum brake which consists of a tube 75 coupled to thetop 71 by means of suitable fittings 7,6.

This tube 75 is connected to a small valve controlled cavity 77 formedin the top 7% The top of this cavity is provided with a rubber valveseat 73 having a hole in the center thereof in alignment with theopening to the tube 75.. This rubber valve seat 78 is held in place bybottom 82 thereof is'spaced from the valve seat 78 so as to open theinlet to the tube 75. The valve member .81 has an outside diametersomewhat smaller than the inside i formidin the bottom cap 83. The topperipheral'edge of the ring 95 is engaged by the bottom edge ,of thetubular body member of the controller 20 to hold this ring in place. Thehole 96 formed in the center of the ring 95 is made large enough toclear the flange 85 and the top of the bushing 84 so'as to provide apassage from the inside of the float valve 88 to the channel 97 formedin the bottom capes, This channel 97 is connected to the drain pipe 98shown in Fig. 2. A plurality of rods '99 are fitted into spaced holesformed in the ring 95 and these rodsrare provided with nuts 109 at thetops thereof for holding the sheet metal covering 191 on the top .of thesheet metal can 102 which surrounds the rods 99 and the float valve88..v The bottom edge of the sheet metal can 102 also engages .the topof the ring 95 and portions of the bottom of sheet metal can 102 are cutaway to provide a plurality of small ho les 103 at the bottom of thecan. The purpose of this can 102 and ,thercover 101 attached thereto isto provide a closure over the'float valve 88 and to limit the upwardmovement of this float valve.

The operation of this apparatus is as follows. When the car 10 is movedinto the spraying station 15 the wheels 12 engage the shoes 50 of thebars 30 and lift these bars. It is .obvious that when the car 10 ismoved into this station 15 the forward wheel 12 will engage the firstshoe 50 of the'bars 3.0 and raise one end of these bars.

are of just sufficient length so that when only one end of the bars 30is lifted by the forward wheels 12, for example, the bolt 28 of thesebars slides in the slots 31 and the valve controller rods are notactuated or lifted. However, when both the forward and rear wheels 12 ofthe car '10 are under the respective shoes 50 of the bars 30, these barsare lifted to a greater height and the bolt 28 engages the top surfacesof the slots '31 thus lifting the clevis 32 and the valve controlleractuating rods 33, 38, 44 and 45 so that the top end of the rod 45 firstopens the small relief valve 87 in the float:

valve 88 and thereafter raises the float valve 88.

assumed that the diaphragm 54 of the valve 19 is in its closed positionand that the cavity 61 above the diaphragm 54 as well as the c21 ity 74are full of water or any other liquid that is to be used in thisapparatus. Inasmuch as the cavity 61 is connected to the supply channel60 in the valve 19 through the small opening 59, the fluid pressure onboth sides of the diaphragm 54 will be equalized. Liquid also fills thatcavity 74 of the controller 20 with the exception of the thimble 81 ofthe vacuum brake valve, which is partially filled with air and thereforefloats on the liquid in the cavity 74 and is pressed against the valveseat 78 so as to close the vacuum brake valve.

As previously mentioned, the rod 45 opens the small relief valve 87 inthe fioat'valve 88 when the car is brought into the washing station 15.Opening the small relief valve 87 allows a small amount of water to passtherethrough into the air space in the float valve 88, which is restingunder pressure on the ring 95, and as a result the pressure in thecavity 74 of the controller 20 practically instantaneously drops toalmost atmospheric pressure since the channel 97 is connected to theopen drain pipe 98. After the pressure is released, the spring 90 in therelief valve 87, being quite strong, cause .the float valve 88 to riseup against the seat ring 94. The float valve 88 after being lifted offits seat on the ring 95 by the combined action of the relief valvespring 90 and the rod 45 remains afloat in the liquid in the cavity 74because of the buoyancy of the air trapped'within the body of this floatvalve, .until the water level in the cavity 74 of the controller dropsto the point where the float valve 88 may again come to rest on its seaton the ring 95 at which time the cavity 74 of the controller 20 againbegins to be filled with water from the valve 19 through the orifice 59in the diaphragm 54 and through the tube 21.

When the float valve 88 is first lifted off from its seat the water inthe controller cavity 74 begins to escape .throughthe holes 103 formedin the bottom of the can 102, through the port 96, the channel 97 andthe drain pipe 98. At the same time air is admitted into the cavity 74through the vacuum brake valve at the top of this cavityand through thepipe 75 because the thimble 81 opens this vacuum brake valve. Ifdesired, additional holes may be formed into the can 102 and the cover101 thereof to augment the holes 103.

When'the car is moved into the washing station and the Wheels 12 engagethe respective shoes 50 so as to lift both ends of the bars 39 asufficient height so that these bars lift the clevis 32 and the rods 33,38, 44 and 45 to open the relief valve 87 that is positioned on thefloat valve 88, the pressure in the cavity 74 drops quickly toalmostatmospheric pressure as described above.

Since the cavity 74 is connected to the cavity 61 of the valve "19through the tube 21, the pressure in the cavity 61 also drops quicklyand as a result the water pressure in the channel raises the diaphragm54 from its seat on the upper lip of the wall 57 and water is allowed topass through the valve 19 to the pipes 18, 17 and 16 and out of thespray outlets 14 to spray the material 11 on the car 10. This sprayingaction goes on while the water from the cavity 74 is being drained outthrough the channels 96 and 97 and the drain pipe 98. When the cavity 74has drained sufiiciently to permit the fioat'valve 88, which issubstantially filled with air, to come to rest on the upper surface ofthe ring 95, this float valve 88 closes the liquid exit through thechannels 96 and 97.: When the exit channel 96 is closed by the floatvalve 88 the cavity 74 again begins to be filled with liquid fiowingthereto through the tube 21 from the cavity 61 which inturn receives theliquid from the Water channel 60 through the orifice 59. During thistime ,whenthe cavity 74.is being filled the diaphragm 54 is in ,its openposition and remains in its open position until .the cavities 61 and 74and the connecting tubing 21.are

filled with fluid. During this time the material 11 on the car 10 isbeing sprayed. It is therefore seen that the volume of these cavities 61and 74 and the connecting tubing control the time during which the sprayis on. Furthermore, the rapidity or rate with which the cavity 74 isfilled also determines the time that the spray is on. Consequently thistime may be varied by varying the size of the orifice opening in thetube 73 that is inserted into the coupling 71, a small orifice openingbeing employed where a long time interval is desired and a largeropening being employed Where a short time interval is desired. Theorifice in the tube 73 also functions to insure smoother operation ofthe valve 19. Furthermore, this orifice also prevents too much air frombeing pushed out of the float valve 88 when the relief valve 87 isopened by the rod 45.

The volume of the cavity 74 may be changed by lengthening or decreasingthe length of the pipe forming this cavity in order to control this timeinterval. For this purpose the tube forming this cavity may be made intwo or more telescoping parts movable with respect to each other andsealed to form a liquid tight body so that the volume of this cavity maybe varied at will.

As previously described, bars 30 are lifted by the wheels 12 of the car10 and this action lifts the rods 33, 38, 44 and 45 to trip the valvecontroller 20. In order to render the operation of this apparatussubstantially foolproof and to permit the valve 19 to be closed at theend of the predetermined time interval even if the car is left in thespray booth 15 with the Wheels 12 holding the bars 30 in raisedposition, there is provided to this invention a cam surface 42 whichcontacts the head 41 of the rod 38 as this rod is moved upward. During aportion of the movement upward of the rod 38, the head 41 engages thebottom of the rod 44. However, when the rod 38 is near the upper extentof its upward motion the cam 42 causes the head 41 to be disengaged fromthe bottom of the rod 44. Thus at this time the rod 44 is free to dropto its lowermost position by its own weight. At the lowermost positionof the rod 44 the fiange at the top thereof rest on the top of thesleeve 43. When the car 10 is moved away so that the bars 30 may drop totheir lowermost position this rod 38 will also drop and because of thecounter weight 40 attached to this rod, the head 41 will be brought intoposition underneath the bottom of the rod 44.

While in the operation of this invention reference Was made to the useof water as the liquid used to spray the material 11 on the car 10, itis of course obvious that other liquids and solutions may be used forspraying, washing, impregnating or treating this material.

It is of course obvious that various modifications may be made in thisinvention and therefore I do not desire to limit this invention to theexact details described and illustrated except in so far as they aredefined by the claims.

What I claim is as follows:

1. In apparatus for controlling liquid sprayers the combination of acarrier for carrying the material to be sprayed, Wheels for saidcarrier, spraying means for spraying said material, means for movingsaid carrier into position opposite said spraying means for sprayingsaid material, a valve connected to said spraying means for controllingthe supply of spraying fluid thereto, said valve having a diaphragm anda cavity above said diaphragm, said diaphragm having an orifice thereinto permit the fluid pressure on both sides of said diaphragm to beequalized, a tube connected to said cavity, a second cavity connected tosaid first cavity through said tube so that said second cavity is alsofilled with fluid, auxiliary valve means in said second cavity, a rodpositioned in the bottom of said second cavity, means for controllingthe building up of pressure in said cavities to permit said valve toremain open for a predetermined time interval after said auxiliary valvemeans is closed, means actuated by said carrier for anneal actuatingsaid rod when said carrier is moved into said position, said meansactuated by said carrier comprising a bar, means for engaging saidwheels of said carrier for lifting said bar, means actuated by said barfor lifting said rod to open said auxiliary valve means to reduce thepressure in both of said cavities and permit said valve to open, andmeans for disengaging said last mentioned means from said red when saidrod has been actuated.

2. In apparatus for controlling liquid sprayers the combination of acarrier for carrying the material to be sprayed, spraying means forspraying said material, means for moving said carrier into positionopposite said spraying means for spraying said material, a valveconnected to said spraying means for controlling the supply of sprayingfiuid thereto, said valve having a diaphragm and a cavity above saiddiaphragm, said diaphragm having an. orifice therein to permit the fluidpressure on both sides of said diaphragm to be equalized, a tubeconnected to said cavity, a second cavity connected to said first cavitythrough said tube so that said second cavity is also filled with fluid,auxiliary valve means in said second cavity, a rod positioned in thebottom of said second cavity, means for controlling the building up ofpressure in said cavities to permit said valve to remain open for apredetermined time interval after said auxiliary valve means is closed,means actuated by said carrier for actuating said rod when said carrieris moved into said position, said auxiliary valve means comprising afloat valve positioned in the bottom of said second cavity and a reliefvalve positioned in the top of said float valve, said relief valve beingadapted to be opened by said rod to reduce the pressure in both of saidcavities and permit the said first mentioned valve to open.

3. In apparatus for controlling liquid sprayers the combination of acarrier for carrying the material to be sprayed, spraying means forspraying said material, means for moving said carrier into positionopposite said spraying means for spraying said material, a valveconnected to said spraying means for controlling the supply of sprayingfluid thereto, said valve having a diaphragm and a cav'ity above saiddiaphragm, said diaphragm having an orifice therein to permit the fluidpressure on both sides of said diaphragm to be equalized, a tubeconnected-to said cavity, a second cavity connected to said first cavitythrough said tube so that said second cavity is also filled with fluid,auxiliary valve means in said second cavity,

a rod positioned in the bottom of said second cavity for opening saidauxiliary valve means, means for controlling the building up of pressurein said cavities to permit said valve to remain open for a predeterminedtime interval after said auxiliary valve means is closed, means actuatedby said carrier for actuating said rod when said carrier is moved intosaid position, and a vacuum brake valve positioned at the top of saidsecond cavity, said vacuum brake valve being adapted to be opened whensaid auxiliary valve 7 means is opened to permit air to enter saidsecond cavity.

4. In apparatus for controlling liquid sprayers the combination of acarrier for carrying the material to be sprayed, spraying means forspraying said material, means for moving said carrier into positionopposite said spraying means for spraying said material, a valveconnected to said spraying means for controlling the supply of sprayingfluid thereto, said valve having a diaphragm and a cavity above saiddiaphragm, said diaphragm having an orifice therein to permit the fluidpressure on both sides of said diaphragm to be equalized, a tubeconnected to said cavity, a second cavity connected to said first cavitythrough said tube so that second cavity is also filled with fluid,auxiliary valve means in said second cavity, a rod positioned in thebottom of said second cavity, means for controlling the building up ofpressure in said cavities to permit said valve to remain open for apredetermined time interval after said auxiliary valve means is closed,means actuated by said carrier-for actuating said rod when said carrieris moved into said position, said auxiliary valve means comprising a'float valve positioned in the bottom of said sec- 'ond cavity and arelief valve adapted to be opened by said rod to reduce the pressure inboth of said cavities and permit said first mentioned valve to open,said relief valve being positioned at the top of said float valve, and acage positioned around said'float valve to limitthe motion thereof. a i

5. In apparatus for controlling liquid sprayers the combinationof acarrier for carrying-the material to be sprayed, spraying means forspraying said material, means for moving said carrier into positionopposite said spraying means for spraying said material, a valveconnected to said spraying means for controlling the supply of sprayingfluid thereto, said valve having a diaphragm and a cavity above saiddiaphragm, said diaphragm having an orifice therein to permit the fluidpressure on both sides or" said diaphragm to be equalized, atubeconnected to said cavity, a second cavity connected to said firstcavity through said tube so that said second cavity-is also filled withfluid, auxiliary valve means in said second cavity, a rod positioned inthe bottom of said second cavityfor opening said auxiliary valve means,means for controlling the building up of pressure in said cavities topermit said valve to remain open for a predetermined time interval aftersaid auxiliary valve means is closed, means actuated by said carrier foractuating said rod when said carrier is moved into said position, saidlast mentioned means actuating said ro sufiiciently to open saidauxiliary valve means only when said carrier is in a predeterminedposition with respect to said spraying means, and means'for releasingsaid rod from engagement by said last mentioned means after saidauxiliary valve means is opened.

6. In apparatus for controlling liquid sprayers the combination of acarrier for carrying the material to be sprayed, wheels for saidcarrier, spraying means for spraying said material, means for movingsaid carrier into position opposite said spraying means for sprayingsaid material, a valve connected to said spraying means for controllingthe supply of spraying fluid thereto, said valve having a diaphragm andacavity above said diaphragm,

said diaphragm having an orifice therein to permit the fluid pressure onboth sides of said diaphragmto be equalized, a tube connected to saidcavity, a second cavity'connected to said first cavity through said tubeso that said second cavity is also filled with fluid, auxiliary valvemeans in said second cavity,'a rod positioned in the bottom of saidsecond cavity for opening said auxiliary valve means, means ,for'controlling the building up of pressure in said cavities to permit saidvalve to remain open for a predetermined time interval after saidauxiliary valve means is closed, means actuated by said carrier foractuating said rod whensaid carrier is moved into said position, saidmeans actuated by said carrier comprisinga bar adapted to be lifted bysaid wheels of said'carrier and means for linking said bar to said rod,said last mentioned means having means for sufficiently actuating saidrod for opening said auxiliary valve means only when said carrier is ina predeterminedposition with respect .to said spraying means.

7. In apparatus for controlling liquid sprayers the combination of acarrier for carrying the material to be sprayed, wheels for saidcarrier, spraying means for spraying said material, means for movingsaid carrieruinto position opposite "said spraying means for sprayingsaid material, a valve connected to said spraying means for controllingthe supply of spraying fluid thereto, said valve having a diaphragm anda cavity above said diaphragm, said diaphragm having an orifice thereinto permit the fluid pressure on both sides of said diaphragm to beequalized, a tube connected to said cavity, a second cavity connected tosaid first cavity-through said tube so that said second cavity is alsofilled with fluiiauxiliary valve means in said second cavity, a rodpositioned in the bottom of said second cavity for opening saidauxilia'ry valve means, means for controlling the building up ofpressure in said cavities LO permit said valve to remain open for apredetermined time interval after said auxiliary valve means is closed,means actuated by said carrier for actuating said rod when said carrieris moved into said position, said means actuated by said carriercomprising a bar adapted to be lifted by said wheels of said carrier andmeans for linking said bar to said rod, said last mentioned meanscomprising linkage for sufficiently actuating said rod for opening saidauxiliary valve means only when said carrier is in a predeterminedposition with respect to said spraying means, said linkage including apivoted member, a cam for engaging said pivoted member and for pushingsaid pivoted member out of engagement with said rod after said rod hasbeen actuated.

8. In apparatus for controlling liquid sprayers the combination of acarrier for carrying the material to be sprayed, said car ier having apair of Wheels spaced from each other, spraying means for spraying saidmaterial, means for moving said carrier into position opposite saidspraying means for spraying said material, and means actuated by saidWheels or" said carrier for initiating the spraying of said material,said pair of wheels of said carrier being spaced apart by a distanceequal substantially to the of said carrier, said means actuated by saidwheels comprising a bar having shoes on each end thereof for engagingsaid wheels, said last mentioned means being adapted to prevent theoperation thereof to initiate the said spraying unless said shoes on theends of said bar are each engaged by a difierent one of said pair ofwheels.

UNITED STATES PATENTS

1. IN APPARATUS FOR CONTROLLING LIQUID SPRAYERS THE COMBINATION OF ACARRIER FOR CARRYING THE MATERIAL TO BE SPRAYED, WHEELS FOR CARRIER,SPRAYING MEANS FOR SPRAYING SAID MATERIAL, MEANS FOR MOVING SAID CARRIERINTO POSITION OPPOSITE SAID SPRAYING MEANS FOR SPRAYING SAID MATERIAL, AVALVE CONNECTED TO SAID SPRAYING MEANS FOR CONTROLLING THE SUPPLY OFSPRAYING FLUID THERETO, SAID VALVE HAVING A DIAPHRAGM AND A CAVITY ABOVESAID DIAPHRAGM, SAID DIAPHRAGM HAVING AN ORIFICE THEREIN TO PERMIT THEFLUID PRESSURE ON BOTH SIDES OF SAID DIAPHRAGM TO BE EQUALIZED, A TUBECONNECTED TO SAID CAVITY, A SECOND CAVITY CONNECTED TO SAID FIRST CAVITYTHROUGH SAID TUBE SO THAT SAID SECOND CAVITY IS ALSO FILLED WITH FLUID,AUXILIARY VALVE MEANS IN SAID SECOND CAVITY, A ROD POSITIONED IN THEBOTTOM OF SAID SECOND CAVITY, MEANS FOR CONTROLLING THE BUILDING UP OFPRESSURE IN SAID CAVITIES TO PERMIT SAID VALVE TO REMAIN OPEN FOR APREDETERMINED TIME INTERVAL AFTER SAID AUXILIARY VALVE MEANS IS CLOSED,MEANS ACTUATED BY SAID CARRIER FOR ACTUATING SAID ROD WHEN SAID CARRIERIS MOVED INTO SAID POSITION, SAID MEANS ACTUATED BY SAID CARRIERCOMPRISING A BAR, MEANS FOR ENGAGING SAID WHEELS OF SAID CARRIER FORLIFTING SAID BAR, MEANS ACTUATED BY SAID BAR FOR LIFTING SAID ROD TOOPEN SAID AUXILIARY VALVE MEANS TO REDUCE THE PRESSURE IN BOTH OF SAIDCAVITIES AND PERMIT SAID VALVE TO OPEN, AND MEANS FOR DISENGAGING SAIDLAST MENTIONED MEANS FROM SAID ROD WHEN SAID ROD HAS BBEN ACTUATED.